<!DOCTYPE html>
<html>
<head>
	<title>document 节点 - 复制内容</title>
</head>
<body>
	<div id="target">
		<input id='content' type="text" name="content" value='这是要复制的内容~~'>
		<input type="button" value="Copy" onclick="doCopy()">
	</div>
	<script type="text/javascript">

		function copyText(dom) {
			var text = dom.value;
			dom.focus();
			dom.select();

			// 当前是否有选中文字
			if (document.queryCommandEnabled('copy')) {
				var success = document.execCommand('copy');
				console.log('Copy Ok'); 
			} else {
				console.log('queryCommandEnabled is false');
			}
		}

		function doCopy(){
			//浏览器是否支持 copy 命令（选中内容复制到剪贴板）
			if (document.queryCommandSupported('copy')) {
				var targetDom = document.getElementById('content');
				copyText(targetDom);
			}else{
				console.log('浏览器不支持');
			}
		}
	</script>
</body>
</html>